Getting a normal map to work in a multiple uv node setup
I'm not sure what happens with beach but there're several problems.


Don't plug output of the Normal map into the Displacement input, see this very good answer for more info. In your case it may be enough to use only normal maps. 
Consider plugging image into the Normal Map node if it's the result of processing with using some programs where the result is image of purple color. Otherwise plug it into the Bump node instead (the link above again can be helpful).
(less important) Why not using UV Map node and Attribute one instead ? 
Regarding to UV maps I think it's better to search for some questions here or to ask new one (as it seems to be arranging and managing the UV maps). Basically you press CtrlA to average islands' scale and CtrlP to make them fit in the texture space (pack them); but the exact way depends on situation, it may be needed to use some other tricks like stitching etc.

You may want to read about normal maps, how to and how not to bake normal maps and a lot more

See wiki article for more info on creating, editing and managing UV maps.